package com.googlecode.zeroxcafe;

import android.annotation.TargetApi;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;
import android.webkit.WebView;

/**
 * Activity that shows the wiki HTML page. It uses an
 * {@link android.webkit.WebView} for that.
 * 
 * @author Hans
 */
public class WikiActivity extends Activity {

	private WebView webView;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_wiki);
		// Show the Up button in the action bar.
		setupActionBar();

		this.webView = (WebView) findViewById(R.id.content);

		new HtmlLoaderTask().execute();
	}

	private class HtmlLoaderTask extends AsyncTask<Void, Void, String> {
		protected String doInBackground(Void... params) {
			try {
				String html = RawUtils.loadStringRes(WikiActivity.this,
						R.raw.wiki);
				String css = RawUtils.loadStringRes(WikiActivity.this,
						R.raw.style);

				return html.replace("{{style}}", css);
			} catch (Exception e) {
				return e.toString();
			}
		}

		protected void onPostExecute(String result) {
			webView.loadDataWithBaseURL(null, result, "text/html",
					RawUtils.RESOURCE_ENCODING, null);
		}
	}

	/**
	 * Set up the {@link android.app.ActionBar}, if the API is available.
	 */
	@TargetApi(Build.VERSION_CODES.HONEYCOMB)
	private void setupActionBar() {
		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
			getActionBar().setDisplayHomeAsUpEnabled(true);
		}
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case android.R.id.home:
			// This ID represents the Home or Up button. In the case of this
			// activity, the Up button is shown. Use NavUtils to allow users
			// to navigate up one level in the application structure. For
			// more details, see the Navigation pattern on Android Design:
			//
			// http://developer.android.com/design/patterns/navigation.html#up-vs-back
			//
			NavUtils.navigateUpFromSameTask(this);
			return true;
		}
		return super.onOptionsItemSelected(item);
	}

}
